Manage Your Records
How Knack Works
Design Your Database
Do More With Knack
View and Share Your App
Build Your Live Application
Connect Related Data
Reporting & Dashboards
E-Commerce & Payments
Search & Queries
Emails & Notifications
Calculations & Logic
Users & Access
Working with Pages
Deleting a Page That's Being Linked to
Printing Pages & PDFs
Objects & Connections
Plan Your Objects
Plan Your Connections: Complex Example
Plan Your Connections: Simple Example
Connecting Records Together
Use Connections in Your App
Working With Objects
Connections: Troubleshooting & FAQs
Live App Design
Embed Your App
Integrate with Formstack Documents
Integrate with Zapier
Integrate with Integromat
Working with Icons
Other Customization Options
Using Action Links
Using Record Rules
Table Column Settings
Combining Fields from Connected Records in Views
Source: Which Records Will the View Display
Using Display Rules
Using Submit Rules
Working with Records
CSV Format Guide for Importing
Tasks & Emails
Users & Logins
Live App Security Settings
Live App Security Settings: HIPAA Plans
Manage Roles & Permissions
Manage User Records
Users and the Page Menu
Single Sign-On with Google, Facebook, Twitter, and Custom
Logins and Registrations
Working With Support
What is a dedicated support manager?
Is there an option to pay via invoice, check, wire transfer, or something other than a credit card?
Where can I find a copy of my receipt or invoice?
I'm over the storage limit for my account. How do I add more storage or get under the limit?
I'm over the record limit for my account. How do I add more records or get under the limit?
How do I freeze or pause my Knack account?
Need account access or to transfer account access because account owner or colleague left the company
How do I cancel my Knack account?
How do I add more API calls to my account?
How do I remove the "Powered by Knack" logo at the bottom of my app?
How do I give Builder access to a colleague or developer for one of my apps?
How do I change the favicon for my app?
How do I backup or export my apps and data?
How do I white label my app?
How do I copy an app from my account to another account?
How can I track what users are doing in my app?
How do I find the most recent date from a connected object?
How do I move or copy fields or data from one object to another?
How do I add a logo to my app?
How can I change the color of something in my app?
The menu isn't showing for my app on mobile devices. How do I fix that?
How do I create a field that always shows today's date?
How do I show multiple dates on a calendar?
Is there a way to add a display rule to multiple columns at one time instead of having to update each column individually?
How can I show a customer's payment history if I'm collecting payments through my Knack app and through cash or check?
Can I combine two date fields into a single date field? For example, combining a start and end date into a single field?
Is it possible to display more than 100 records at a time on a table, list, or search view?
Is there a way to have new users be automatically logged-in after they register?
Do I need a separate user role object for my Vendors, Customers, Employees, Contacts, etc?
How do I create an "If, Then" or conditional equation?
Does Knack offer a service for building apps or have developers I can hire?
How can I set up my app so users see only their own data?
How do I bulk upload or import multiple images?
How do I bulk upload or import multiple files?
How do I merge my apps, or copy pages, objects, or other app elements between my apps?
Can I share or connect data between apps?
Can I customize the look and feel of my Knack pages?
Can I migrate or transfer data from Zoho, Quickbase, or TrackVia?
Can I add Google Analytics to my Knack app?
Do you have a sandbox or developer environment?
Can I integrate Knack with other data, products, and services?
Can I have an app in a language besides English?
Can I use Knack on mobile devices?
Can I create invoices and accept payments?
Can I migrate my Access, Filemaker, SQL, or other databases?
Can I use a barcode or credit card scanner with Knack?
Can I prototype for others?
Can I send SMS or text messages using Knack?
Can I email PDFs or other attachments to users with Knack?
Can I add chat or messaging to my app?
Can I sell my Knack apps?
Does the signature captured through a signature field constitute a legally binding signature?
How does Knack work on mobile devices? Is it mobile-friendly? Can users download my apps?
Storing sensitive data (credit cards, social security numbers, etc.)
How secure is Knack?
Will Knack sign an NDA (Non-Disclosure Agreement)?
Does Knack offer access to beta features?
Does Knack offer a partner program?
Is Knack GDPR compliant?
How do I batch download all of the images and files In my app?
Which browsers do you support?
Some of my fields aren't importing correctly. How can I fix that?
I'm having trouble importing into a connection field. What can I do?
I'm seeing an odd character when importing data. How can I get rid of it?
Can I import something other than data? Like objects, pages, views, etc?
My import is failing or getting stuck. What do I do?
Can my users import data from the live app, instead of going through the builder/back-end?
Can I schedule or automate imports?
Can I import data into more than one object at the same time?
Can I undo or reverse an import?
I am importing data for the first time. How do I do that?
How do I update existing data using an import?
My import is taking a long time. Can you take a look?
I'm having trouble importing into a specific type of field. What can I do?
I'm getting an error when importing. What do I do?
Do the validation rules on fields trigger when importing data?
How To Guides
Users & Logins
Save a User's Payment Method
Force Users to Reset Their Passwords
Create a Single Login Page for Multiple User Roles
Show Records Connected To The Logged-in User's Company Or Other Group
Create an Admin User Role to View All Records
Add Read-Only Access For Users
Show Records Connected to the Logged-in User
Add Functionality to Your Live App
Manage Your Records
Use an Edit Form to Create Records If They Don't Exist
Use Zapier to Insert Connected Records
Copy a Record Using Record Rules
Create a Version History for Records
Track When Records are Created and Updated
Track Which User Last Updated a Record
Workflow & Automations
Add Stages to Your App
Add Status Indicators to Your App
Add Assignments to Your App
Notify a User That an Item is Ready for Review
Create a Registration Form with Limited Availability
Add a Pipeline to Your App
Create a Button or Link that Updates a Field to a Custom Value
Add Notification & Reminder Emails to Your App
Approve New Records Before Displaying Them
Store Multiple Images or Files for Individual Records
Use Multiple Image Sources for a Single Image Field
Work with Connected Records
How to Show Multiple Fields in Your Connection Drop-Down
Showing Parent-Child Records in the Live App
Logic, Equations & Formulas
How to Display Multiple Date Formats Using a Single Date Field
How To Number Line Items
Show Upcoming Birthdays
How to Set a Random ID
Display a Message When a Deadline is Approaching
Generate Simple Numeric Barcodes Automatically
Calculate Age in Years from a Birthday
How to Extract the Start and End Dates from a Date Field
Start an Auto Increment Field from Any Number
How to Add Inline Editing to a Table
Create a Print-Friendly Invoice Page
How to Click on an Image to Go to Another Page
How to Add Connection Links to Views
How to Add a Map to a Details View
How to Add Groupings to a Table
Reports, Queries, and Summaries
Build a Quiz App
Build an Inventory Manager App
Build an Orders App
Build a Warehouse Manager App
Build a Member Directory
Build a Map Directory or Store Locator App
Create a Multi-Part Form
How to Change the Layout of Forms
How to Add Instructions to a Form
How to Customize the Text on a Submit Button
How to Limit an Uploaded File’s Size
How to Automatically Capture a User’s Location on a Form
How to Allow Users to Add New Options in Forms
How to Use URL Variables to Pre-Populate a Form
Add Read-Only Fields to a Form
How to Create Dynamic Dropdowns in Forms
Manage Your Account
Security & Infrastructure
Builder Two-Factor Authentication
Builder Security Settings for All Knack Plans
Security Best Practices
Manage Your Account
Table of Contents
Updated by Danielle Kellogg
This article walks you through building an Inventory Manager app, allowing you to track current inventory levels for your products. Current inventory is updated by tracking incoming shipments and outgoing orders.
The main feature is using Parent-Child Connections and Formulas to aggregate total inventory received from incoming shipments and compare it against total inventory fulfilled via orders.
You can see the example app here.
Define the Objects
You will be adding several objects to store different kinds of records. Think of each object as its own spreadsheet.
Add a Products Object. This stores the details about each individual product being tracked.
Add a Number field called “Starting Inventory” that will be used to track how much inventory each product starts with. By default, our product will always start with 0 quantities:
Add a Purchases object. This stores the details about each product purchase made towards your products.
Replace the first field for an Auto Increment field instead, giving you a unique identifier for each purchase in the database:
Add a Connection Field:
- Product - Connects to Products
From the Connections panel on the right, click green "+” button and select the “Products” object and add it as a one-to-many connection:
Add a Number Field called “Quantity” that will be used to track how much stock will deplete from the total inventory:
Add an Orders object. This stores all the details about each outgoing Order, such as the product needed and total quantity ordered.
This object requires the exact same fields as the Purchases object, so we can copy that into a new object and call it Orders.
You can read more on how to copy an object fields here.
Define the Formulas
The Products object is going to need some Sum Formulas to total the quantity of Inventory Received and Inventory Sent.
Add a Sum field that will track total Quantities from the Purchases connection:
Add a Sum field that will track total Quantities from the Orders connection:
Inventory On Hand
Add an Equation field that adds Starting Inventory to Inventory Received and subtracts the Inventory Sent:
Build the Live App
Now that the data is defined, it's time to build the pages for the live app, so others can use the app as well.
This page manages the Product records.
From Pages, add a new page and select the Products object. When it comes down to selecting the view types, you can select multiple views at once.
Select the Menu view with a form attached to add a new Product record.
Select the Table view to display all Products. Include the Details view for the table and any desired child views (such as a table of all Purchases made for the selected Product):
This page manages Purchase records. When you need to increase inventory for a specific Product, a new Purchase record must be created.
Add a new page and select the Purchases object.
Just like the Current Inventory page, select the Menu view with the form and the table view along with a details view of the selected purchase:
This page manages Orders records. When you need to send a specific Product out, a new Order record must be created.
Add a new page and select the Orders object.
Nothing different here, select the Menu view with the form along with the table view of records: